Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A transmitter using a channel aggregation in which available channels existing in various frequency bands are bound and transmitted and using an Orthogonal Frequency Division Multiplexing (OFDM), an Orthogonal Frequency Division Multiple Access (OFDMA), or a system similar to them as a modulation system, wherein: one or a plurality of transmission units are provided in parallel at a post stage of a subcarrier mapping circuit in correspondence to one or a plurality of frequency bands; one or a plurality of transmission processing units are provided in parallel for each of the transmission units in correspondence to one or a plurality of channels; the transmission processing unit has an inverse fast Fourier transforming circuit or a discrete inverse Fourier transforming circuit, a guard interval (GI) and overlap margin (OM) insertion circuit, and a time-domain windowing processing unit; the time-domain windowing processing unit multiplies a universal time-domain window function in accordance with a spectrum mask and transport electric power which are required in each channel, thereby suppressing out-of-band radiation electric power for every channel of the one or plurality of channels; and a kind and a window transition duration of the universal time-domain window function can be arbitrarily set for every channel of the one or plurality of channels.
This invention relates to wireless communication systems using channel aggregation and OFDM/OFDMA modulation. The problem addressed is managing out-of-band radiation when transmitting data across multiple frequency bands and channels, ensuring compliance with spectrum masks and power constraints. The system aggregates available channels from different frequency bands and transmits them using OFDM, OFDMA, or similar modulation techniques. Multiple transmission units operate in parallel, each corresponding to one or more frequency bands. Each transmission unit further includes parallel transmission processing units, each handling one or more channels. Each transmission processing unit contains an inverse fast Fourier transform (IFFT) or discrete inverse Fourier transform (DIFFT) circuit to convert frequency-domain signals to time-domain signals. A guard interval (GI) and overlap margin (OM) insertion circuit adds protection intervals to prevent inter-symbol interference. A time-domain windowing processing unit applies a universal time-domain window function to suppress out-of-band radiation power for each channel, ensuring compliance with spectrum masks and power requirements. The window function's type and transition duration can be independently adjusted for each channel, allowing flexible adaptation to different regulatory and performance constraints. This approach enables efficient multi-band transmission while minimizing interference with adjacent channels.
2. A transmitter according to claim 1 , wherein the time-domain windowing processing unit multiplies a universal signal amplitude standardization coefficient so that transport electric power control in a baseband can be made.
This invention relates to wireless communication systems, specifically a transmitter design that enables efficient power control in the baseband domain. The transmitter includes a time-domain windowing processing unit that applies a universal signal amplitude standardization coefficient to adjust the signal amplitude. This standardization ensures that the transmit power can be precisely controlled at the baseband level before the signal is upconverted to the radio frequency (RF) domain. The standardization coefficient is applied to the signal in the time domain, allowing for dynamic adjustments to maintain consistent power levels across different transmission conditions. This approach simplifies power control by avoiding the need for complex RF-level adjustments, improving efficiency and reducing hardware complexity. The transmitter may also include other components, such as a digital-to-analog converter and an upconverter, to process the signal from the digital baseband to the RF domain. The standardization coefficient is derived from the signal characteristics to ensure optimal power control while minimizing distortion. This design is particularly useful in modern wireless systems where precise power control is essential for maintaining signal integrity and compliance with regulatory standards.
3. A transmitter according to claim 1 , further comprising a summing circuit for synthesizing a plurality of transmission processing units, and wherein an output of the summing circuit is transmitted in a wireless or wired manner.
A transmitter system is designed to enhance signal transmission efficiency in communication networks. The system addresses the challenge of integrating multiple transmission processing units while maintaining signal integrity and reducing complexity. The transmitter includes a summing circuit that synthesizes outputs from multiple transmission processing units, combining them into a single composite signal. This synthesized signal is then transmitted either wirelessly or through a wired connection, depending on the application requirements. The summing circuit ensures that the combined signal retains the necessary characteristics for reliable transmission, improving overall system performance. By consolidating multiple processing units into a unified output, the transmitter simplifies the transmission process while maintaining high data integrity and reducing hardware overhead. This approach is particularly useful in applications requiring high-speed data transfer or multi-channel communication, such as telecommunications, broadcasting, or industrial control systems. The system's flexibility allows it to adapt to various transmission mediums, making it suitable for diverse communication environments.
4. A transmitter according to claim 1 , wherein a frequency shift can be arbitrarily set for every channel in accordance with channel requirements.
A transmitter system is designed to enable flexible frequency allocation in wireless communication networks. The system addresses the challenge of efficiently managing frequency resources in environments where different channels have varying requirements, such as bandwidth, interference sensitivity, or regulatory constraints. The transmitter includes a frequency shifting mechanism that allows the frequency of each channel to be independently adjusted based on specific channel needs. This arbitrary frequency setting capability ensures optimal spectrum utilization, reduces interference, and enhances overall network performance. The system dynamically adapts to changing conditions by reconfiguring channel frequencies as required, supporting both fixed and adaptive frequency assignments. This flexibility is particularly useful in dense wireless deployments, where interference mitigation and spectrum efficiency are critical. The transmitter may also incorporate additional features, such as power control and modulation schemes, to further optimize communication quality. By enabling precise frequency control per channel, the system improves reliability and throughput in diverse wireless applications, including cellular networks, IoT devices, and satellite communications.
5. A transmission method using a channel aggregation in which available channels existing in various frequency bands are bound and transmitted and using an Orthogonal Frequency Division Multiplexing (OFDM), an Orthogonal Frequency Division Multiple Access (OFDMA), or a system similar to them as a modulation system, wherein: one or a plurality of transmission units are provided in parallel at a post stage of a subcarrier mapping circuit in correspondence to one or a plurality of frequency bands; one or a plurality of transmission processing units are provided in parallel for each of the transmission units in correspondence to one or a plurality of channels; an inverse fast Fourier transforming process or a discrete inverse Fourier transforming process, a guard interval (GI) and OM inserting process, and a time-domain windowing process are sequentially executed by the transmission processing unit; the time-domain windowing process is executed by multiplying a universal time-domain window function in accordance with a spectrum mask and transport electric power which are required in each channel, thereby suppressing out-of-band radiation electric power for every channel of the one or plurality of channels; and a kind and a window transition duration of the universal time-domain window function can be arbitrarily set for every channel of the one or plurality of channels.
This invention relates to wireless communication systems using channel aggregation and OFDM/OFDMA modulation. The method addresses the challenge of efficiently transmitting data across multiple frequency bands while minimizing interference and meeting regulatory spectrum mask requirements. The system binds available channels from different frequency bands and processes them in parallel using OFDM or OFDMA modulation. A subcarrier mapping circuit distributes data to one or more transmission units, each corresponding to a specific frequency band. Within each transmission unit, multiple transmission processing units handle individual channels. Each processing unit performs an inverse fast Fourier transform (IFFT) or discrete inverse Fourier transform, adds a guard interval (GI) and overhead management (OM) data, and applies a time-domain windowing process. The windowing process uses a universal time-domain window function tailored to each channel's spectrum mask and power constraints, reducing out-of-band radiation. The window function type and transition duration can be dynamically adjusted per channel, allowing flexible compliance with different regulatory and performance requirements. This approach improves spectral efficiency and reduces interference in multi-band communication systems.
6. A receiver using a channel aggregation in which available channels existing in various frequency bands are bound and transmitted and using an Orthogonal Frequency Division Multiplexing (OFDM), an Orthogonal Frequency Division Multiple Access (OFDMA), or a system similar to them as a modulation system, wherein: one or a plurality of reception units are provided in parallel in correspondence to one or a plurality of frequency bands; one or a plurality of reception processing units are provided in parallel for each of the reception units in correspondence to one or a plurality of channels; the reception processing unit has a guard interval (GI) removing unit, a time-domain windowing processing unit, and a fast Fourier transforming circuit; the time-domain windowing processing unit multiplies a universal time-domain window function in accordance with a spectrum mask and transport electric power which are required in each channel, thereby suppressing out-of-band radiation electric power for every channel of the one or plurality of channels; and a kind and a window transition duration of the universal time-domain window function can be set to the same kind and duration as those on a transmission side.
This invention relates to a receiver for wireless communication systems that use channel aggregation across multiple frequency bands and employ Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), or similar modulation techniques. The system addresses challenges in managing interference and signal integrity when aggregating multiple channels from different frequency bands. The receiver includes parallel reception units, each corresponding to one or more frequency bands, and parallel reception processing units within each reception unit, each handling one or more channels. Each reception processing unit contains a guard interval (GI) removal unit, a time-domain windowing processor, and a fast Fourier transform (FFT) circuit. The time-domain windowing processor applies a universal time-domain window function tailored to the spectrum mask and transmit power requirements of each channel, effectively suppressing out-of-band radiation for every channel. The window function's type and transition duration can be synchronized with the transmission side, ensuring consistency in signal processing. This design improves spectral efficiency and reduces interference in multi-band, multi-channel communication systems by dynamically adjusting windowing parameters to meet regulatory and performance constraints. The parallel processing architecture enhances scalability and adaptability across diverse frequency bands and channel configurations.
Unknown
March 3, 2020
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